iphone - 如何在选择时使用自定义标签栏项目而未选择透明标签栏项目

Question

我有两个自定义标签栏项目，当它们在某个控制器中被选中时，我希望它们以颜色突出显示。但是，当它们未被选中时，我希望标签栏显示我创建的透明标签栏项目图像。

我尝试在视图控制器中实现相应的代码，但它不能正常工作。

[[self tabBarItem] setFinishedSelectedImage:[UIImage imageNamed:@"tab.png"] `withFinishedUnselectedImage:[UIImage imageNamed:@"transparent.png"]];`

在- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil方法中

我究竟做错了什么？

Answer 1

使用以下内容自定义标签栏：

//UITabBar Customizing Appearance
{
    [[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"tabBarBg"]];

    int numberOfTabs = 0;
    numberOfTabs = [[self.tabBarController viewControllers] count];

    UIImage *selectionIndicatorImage = [UIImage imageNamed:@"selectionIndicatorImage"];
    if (numberOfTabs) {
        selectionIndicatorImage = [AppDelegate scaleImage:selectionIndicatorImage
                                                   toSize:CGSizeMake((320.0/numberOfTabs), selectionIndicatorImage.size.height)];
    }

    [[UITabBar appearance] setSelectionIndicatorImage:selectionIndicatorImage];        
    [[UITabBar appearance] setSelectedImageTintColor:[UIColor colorWithRed:0.0 green:169.0/255.0 blue:157.0/255.0 alpha:1.0]];

    [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                       [UIColor colorWithWhite:1.0 alpha:1], UITextAttributeTextColor,
                                                       [UIColor lightGrayColor], UITextAttributeTextShadowColor, nil]
                                             forState:UIControlStateNormal];
    [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                       [UIColor colorWithWhite:1.0 alpha:1], UITextAttributeTextColor,
                                                       [UIColor lightGrayColor], UITextAttributeTextShadowColor, nil]
                                             forState:UIControlStateSelected];
}

使用创建的图像作为选定和未选定选项卡项目的图像。您也可以指定选项卡的数量。